{"abstract":"The U.S. Environmental Protection Agency (EPA or Agency) is proposing to partially approve and partially conditionally approve changes to South Carolina's State Implementation Plan (SIP) to revise source testing requirements and regulations prescribing control requirements for certain stationary sources of nitrogen oxides (NO<INF>X</INF>) submitted by the State of South Carolina, through the South Carolina Department of Environmental Services (SC DES), on October 1, 2007; July 27, 2016; September 5, 2017; April 24, 2020; and February 4, 2022. This action is being proposed pursuant to the Clean Air Act (CAA or Act).","action":"Proposed rule.","agencies":[{"raw_name":"ENVIRONMENTAL PROTECTION AGENCY","name":"Environmental Protection Agency","id":145,"url":"https://www.federalregister.gov/agencies/environmental-protection-agency","json_url":"https://www.federalregister.gov/api/v1/agencies/145","parent_id":null,"slug":"environmental-protection-agency"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2026/08/19/2026-16932.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"52","title":40}],"citation":"91 FR 53573","comment_url":null,"comments_close_on":"2026-09-18","correction_of":null,"corrections":[],"dates":"Comments must be received on or before September 18, 2026.","disposition_notes":null,"docket_ids":["EPA-R04-OAR-2025-0017","FRL-13063-01-R4"],"dockets":[{"supporting_documents":[{"title":"20260811 Backlogged SIPs Letter to SC","document_id":"EPA-R04-OAR-2025-0017-0011"},{"title":"SC Response to SIP Backlog_03_23_2020","document_id":"EPA-R04-OAR-2025-0017-0010"},{"title":"SC Parallel Processing and Clarification Letter 20260721","document_id":"EPA-R04-OAR-2025-0017-0009"},{"title":"SC NOx SIP Commitment 20260513","document_id":"EPA-R04-OAR-2025-0017-0008"},{"title":"SC NOx No Action Letter 20260513","document_id":"EPA-R04-OAR-2025-0017-0007"},{"title":"February 3 2022 Submittal Combined","document_id":"EPA-R04-OAR-2025-0017-0006"},{"title":"April 24 2020 Submittal Combined","document_id":"EPA-R04-OAR-2025-0017-0005"},{"title":"July 25 2016 Submittal Combined","document_id":"EPA-R04-OAR-2025-0017-0004"},{"title":"September 5 2017 Submittal Combined","document_id":"EPA-R04-OAR-2025-0017-0003"},{"title":"October 1 2007 Submittal Combined","document_id":"EPA-R04-OAR-2025-0017-0002"}],"agency_name":"EPA","documents":[{"comment_count":5,"comment_start_date":"2026-08-19","updated_at":"2026-09-19T01:56:47.290-04:00","comment_url":"https://www.regulations.gov/commenton/EPA-R04-OAR-2025-0017-0012","allow_late_comments":false,"id":"EPA-R04-OAR-2025-0017-0012","comment_end_date":"2026-09-19","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":11,"id":"EPA-R04-OAR-2025-0017","title":"Air Plan Partial Approval and Partial Conditional Approval; South Carolina; Control of Oxides of Nitrogen and Source Testing Requirements"}],"document_number":"2026-16932","effective_on":null,"end_page":53597,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/08/19/2026-16932.xml","html_url":"https://www.federalregister.gov/documents/2026/08/19/2026-16932/air-plan-partial-approval-and-partial-conditional-approval-south-carolina-control-of-oxides-of","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-16932?publication_date=2026-08-19","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-08-19/2026-16932/mods.xml","not_received_for_publication":null,"page_length":25,"page_views":{"count":394,"last_updated":"2026-10-24 00:15:05 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-08-19/pdf/2026-16932.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-16932.pdf?1787057119","publication_date":"2026-08-19","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/08/19/2026-16932.txt","regulation_id_number_info":{},"regulation_id_numbers":[],"regulations_dot_gov_info":{"supporting_documents":[{"title":"20260811 Backlogged SIPs Letter to SC","document_id":"EPA-R04-OAR-2025-0017-0011"},{"title":"SC Response to SIP Backlog_03_23_2020","document_id":"EPA-R04-OAR-2025-0017-0010"},{"title":"SC Parallel Processing and Clarification Letter 20260721","document_id":"EPA-R04-OAR-2025-0017-0009"},{"title":"SC NOx SIP Commitment 20260513","document_id":"EPA-R04-OAR-2025-0017-0008"},{"title":"SC NOx No Action Letter 20260513","document_id":"EPA-R04-OAR-2025-0017-0007"},{"title":"February 3 2022 Submittal Combined","document_id":"EPA-R04-OAR-2025-0017-0006"},{"title":"April 24 2020 Submittal Combined","document_id":"EPA-R04-OAR-2025-0017-0005"},{"title":"July 25 2016 Submittal Combined","document_id":"EPA-R04-OAR-2025-0017-0004"},{"title":"September 5 2017 Submittal Combined","document_id":"EPA-R04-OAR-2025-0017-0003"},{"title":"October 1 2007 Submittal Combined","document_id":"EPA-R04-OAR-2025-0017-0002"}],"comments_count":5,"agency_id":"EPA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=EPA-R04-OAR-2025-0017","supporting_documents_count":11,"docket_id":"EPA-R04-OAR-2025-0017","document_id":"EPA-R04-OAR-2025-0017-0012","regulation_id_number":null,"title":"Air Plan Partial Approval and Partial Conditional Approval; South Carolina; Control of Oxides of Nitrogen and Source Testing Requirements","checked_regulationsdotgov_at":"2026-09-20T08:55:04Z"},"regulations_dot_gov_url":null,"significant":null,"signing_date":null,"start_page":53573,"subtype":null,"title":"Air Plan Partial Approval and Partial Conditional Approval; South Carolina; Control of Oxides of Nitrogen and Source Testing Requirements","toc_doc":"South Carolina; Control of Oxides of Nitrogen and Source Testing Requirements","toc_subject":"Air Quality State Implementation Plans; Approvals and Promulgations","topics":["Air pollution control","Environmental protection","Incorporation by reference","Nitrogen dioxide","Reporting and recordkeeping requirements"],"type":"Proposed Rule","volume":91}